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Eristalis hirtus - Eristalis hirta

Eristalis hirtus - Eristalis hirta
Fremont, Alameda County, California, USA
January 12, 2009
Chris Thompson: "the Eristalis is probably hirtus Loew".

The feature about concolorous
The feature about concolorous tarsi on the middle leg is now shown to be unreliable , I now think it is E.hirta because the hind metatarsus is not inflated as in E. arbustorum. A feature I discovered in British Hoverflies by Alan E. Stubbs and Steven J. Falk.

If you look through the right
If you look through the right wing, the basal tarsus on the middle leg is yellow , the apical tarsi brown to black.
Eristalis hirta has all the tarsi the same brown colour.
Probably E.arbustorum but we need to see the face.

A change of mind
A change of mind. I`m sure this is E.hirta now.

Chris Thompson Ided
F. Christian Thompson
Adjunct Scientist (Emeritus)
Department of Entomology
Smithsonian Institution

He identified this. I would want he and Martin Hauser to review this before changing it.

I agree with Alice -
Bill Dean, you should take a look at the Manual of Nearctic Diptera
Vol. II, 713
Syrphidae by J.R. Vockeroth and F.C. Thompson [yes, the same F.C. Thompson who gave Alice the ID]
Eristalis (Eoseristalis Kanervo), 741
17 spp.; widespread; Curran 1930a, Telford 1970 (both as part of Eristalis)
Curran, C.H. 1930a. New species of Eristalinae with notes ((Syrphidae, Diptera). Am. Mus. Novit. 411: 1-27.
Telford, H.S. 1970. Eristalis (Diptera: Syrphidae) from America North of Mexico. Ann. ent. Soc. Am. 63: 1201-1210.

The hind metarsus is not inflated
The hind metatarsus is not inflated which makes me sure this is E. hirta now. The yellow markings do not reach the posterior edge of tergite 2, even at the sides of the abdomen which makes me think this is Eristalis hirta but I`m not sure this is a reliable feature.

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